vchiq_kmod.c

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    1 /*-
    2  * Copyright (c) 2012-2015 Oleksandr Tymoshenko <gonzo@freebsd.org>
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD$");
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/bus.h>
   32 #include <sys/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/malloc.h>
   35 #include <sys/rman.h>
   36 #include <sys/timeet.h>
   37 #include <sys/timetc.h>
   38 #include <sys/watchdog.h>
   39 #include <machine/bus.h>
   40 #include <machine/cpu.h>
   41 #include <machine/frame.h>
   42 #include <machine/intr.h>
   43 
   44 #include <dev/fdt/fdt_common.h>
   45 #include <dev/ofw/openfirm.h>
   46 #include <dev/ofw/ofw_bus.h>
   47 #include <dev/ofw/ofw_bus_subr.h>
   48 
   49 #include <machine/bus.h>
   50 #include <machine/fdt.h>
   51 
   52 #include "vchiq_arm.h"
   53 #include "vchiq_2835.h"
   54 
   55 #define VCHIQ_LOCK      do {            \
   56         mtx_lock(&bcm_vchiq_sc->lock);  \
   57 } while(0)
   58 
   59 #define VCHIQ_UNLOCK    do {            \
   60         mtx_unlock(&bcm_vchiq_sc->lock);        \
   61 } while(0)
   62 
   63 #ifdef  DEBUG
   64 #define dprintf(fmt, args...) printf(fmt, ##args)
   65 #else
   66 #define dprintf(fmt, args...)
   67 #endif
   68 
   69 struct bcm_vchiq_softc {
   70         struct mtx              lock;
   71         struct resource *       mem_res;
   72         struct resource *       irq_res;
   73         void*                   intr_hl;
   74         bus_space_tag_t         bst;
   75         bus_space_handle_t      bsh;
   76         int                     regs_offset;
   77 };
   78 
   79 static struct bcm_vchiq_softc *bcm_vchiq_sc = NULL;
   80 
   81 #define BSD_DTB                 1
   82 #define UPSTREAM_DTB            2
   83 static struct ofw_compat_data compat_data[] = {
   84         {"broadcom,bcm2835-vchiq",      BSD_DTB},
   85         {"brcm,bcm2835-vchiq",          UPSTREAM_DTB},
   86         {"brcm,bcm2711-vchiq",          UPSTREAM_DTB},
   87         {NULL,                          0}
   88 };
   89 
   90 #define vchiq_read_4(reg)               \
   91     bus_space_read_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, (reg) + \
   92     bcm_vchiq_sc->regs_offset)
   93 #define vchiq_write_4(reg, val)         \
   94     bus_space_write_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, (reg) + \
   95     bcm_vchiq_sc->regs_offset, val)
   96 
   97 /* 
   98  * Extern functions */
   99 void vchiq_exit(void);
  100 int vchiq_init(void);
  101 
  102 extern VCHIQ_STATE_T g_state;
  103 extern int g_cache_line_size;
  104 
  105 static void
  106 bcm_vchiq_intr(void *arg)
  107 {
  108         VCHIQ_STATE_T *state = &g_state;
  109         unsigned int status;
  110 
  111         /* Read (and clear) the doorbell */
  112         status = vchiq_read_4(0x40);
  113 
  114         if (status & 0x4) {  /* Was the doorbell rung? */
  115                 remote_event_pollall(state);
  116         }
  117 }
  118 
  119 void
  120 remote_event_signal(REMOTE_EVENT_T *event)
  121 {
  122         event->fired = 1;
  123 
  124         /* The test on the next line also ensures the write on the previous line
  125                 has completed */
  126         if (event->armed) {
  127                 /* trigger vc interrupt */
  128                 dsb();
  129                 vchiq_write_4(0x48, 0);
  130         }
  131 }
  132 
  133 static int
  134 bcm_vchiq_probe(device_t dev)
  135 {
  136 
  137         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
  138                 return (ENXIO);
  139 
  140         device_set_desc(dev, "BCM2835 VCHIQ");
  141         return (BUS_PROBE_DEFAULT);
  142 }
  143 
  144 static int
  145 bcm_vchiq_attach(device_t dev)
  146 {
  147         struct bcm_vchiq_softc *sc = device_get_softc(dev);
  148         phandle_t node;
  149         pcell_t cell;
  150         int rid = 0;
  151 
  152         if (bcm_vchiq_sc != NULL)
  153                 return (EINVAL);
  154 
  155         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
  156         if (sc->mem_res == NULL) {
  157                 device_printf(dev, "could not allocate memory resource\n");
  158                 return (ENXIO);
  159         }
  160 
  161         sc->bst = rman_get_bustag(sc->mem_res);
  162         sc->bsh = rman_get_bushandle(sc->mem_res);
  163 
  164         rid = 0;
  165         sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
  166         if (sc->irq_res == NULL) {
  167                 device_printf(dev, "could not allocate interrupt resource\n");
  168                 return (ENXIO);
  169         }
  170 
  171         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == UPSTREAM_DTB)
  172                 sc->regs_offset = -0x40;
  173 
  174         node = ofw_bus_get_node(dev);
  175         if ((OF_getencprop(node, "cache-line-size", &cell, sizeof(cell))) > 0)
  176                 g_cache_line_size = cell;
  177 
  178         vchiq_core_initialize();
  179 
  180         /* Setup and enable the timer */
  181         if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
  182                         NULL, bcm_vchiq_intr, sc,
  183                         &sc->intr_hl) != 0) {
  184                 bus_release_resource(dev, SYS_RES_IRQ, rid,
  185                         sc->irq_res);
  186                 device_printf(dev, "Unable to setup the clock irq handler.\n");
  187                 return (ENXIO);
  188         }
  189 
  190         mtx_init(&sc->lock, "vchiq", 0, MTX_DEF);
  191         bcm_vchiq_sc = sc;
  192 
  193         vchiq_init();
  194 
  195         bus_generic_probe(dev);
  196         bus_generic_attach(dev);
  197 
  198         return (0);
  199 }
  200 
  201 static int
  202 bcm_vchiq_detach(device_t dev)
  203 {
  204         struct bcm_vchiq_softc *sc = device_get_softc(dev);
  205 
  206         vchiq_exit();
  207 
  208         if (sc->intr_hl)
  209                 bus_teardown_intr(dev, sc->irq_res, sc->intr_hl);
  210         bus_release_resource(dev, SYS_RES_IRQ, 0,
  211                 sc->irq_res);
  212         bus_release_resource(dev, SYS_RES_MEMORY, 0,
  213                 sc->mem_res);
  214 
  215         mtx_destroy(&sc->lock);
  216 
  217         return (0);
  218 }
  219 
  220 
  221 static device_method_t bcm_vchiq_methods[] = {
  222         DEVMETHOD(device_probe,         bcm_vchiq_probe),
  223         DEVMETHOD(device_attach,        bcm_vchiq_attach),
  224         DEVMETHOD(device_detach,        bcm_vchiq_detach),
  225 
  226         /* Bus interface */
  227         DEVMETHOD(bus_add_child,        bus_generic_add_child),
  228 
  229         { 0, 0 }
  230 };
  231 
  232 static driver_t bcm_vchiq_driver = {
  233         "vchiq",
  234         bcm_vchiq_methods,
  235         sizeof(struct bcm_vchiq_softc),
  236 };
  237 
  238 DRIVER_MODULE(vchiq, simplebus, bcm_vchiq_driver, 0, 0);
  239 MODULE_VERSION(vchiq, 1);

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FreeBSD/Linux Kernel Cross Reference sys/contrib/vchiq/interface/vchiq_arm/vchiq_kmod.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/vchiq/interface/vchiq_arm/vchiq_kmod.c